A person who at first has a lot of friends and then ditches them for her his girlfriend then ditches his girlfriend for his friends then ditches his friends for his girlfriend and so-on. In the end he cant figure out what to do. Also doesn't get past "first base".

Chuck: Yo. Paul is such an Unreliable Bassist!
Ricky: Yeah he is always with his girlfriend Cindy!
Chuck: He never chills with us anymore!

Nick: Hey, Paul! You never chill with your girlfriend! whats up with that?
Paul: Well I felt like i ditched you guys so i want to chill with you guys again!
Nick: But now your ditching with your girlfriend!!

Paul: Wow, your right! I have to chill with her!
Nick: Choose who you want to hang out with! Your being such an Unreliable Bassist!